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Pressure, a better layman's term would be vacuum. And there should be vacuum at the oil cap. Nothing to fret over there.
That tapping though. Might just be exacerbated by the phone but that may be something. I don't know what's all in there so best I can manage is a guess of a collapsed lifter maybe.
But being mention of a potential oil leak and most things pointing to something oil related,,, is the oil level correct?
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